MSV11-D/E MOS memory - Revision history

Jnc: /* External links */ +microcomputer processor handbook

2023-07-13T18:44:09Z

‎External links: +microcomputer processor handbook

Jnc: Avoid dab

2022-09-22T12:06:45Z

Avoid dab

Jnc: /* External links */ +manual, FMPS

2022-06-03T01:05:52Z

‎External links: +manual, FMPS

Jnc: +Further reading

2021-02-08T16:25:30Z

+Further reading

Jnc: Explain confusing names

2021-02-08T03:39:45Z

Explain confusing names

Jnc: Jnc moved page MSV11-D MOS memory to MSV11-D/E MOS memory: more accurate title

2021-02-08T03:25:47Z

Jnc moved page MSV11-D MOS memory to MSV11-D/E MOS memory: more accurate title

Jnc: typo

2020-05-05T18:09:19Z

typo

Jnc: Another potential error

2020-05-05T15:40:27Z

Another potential error

Jnc: clarify size variants

2020-05-03T18:46:39Z

clarify size variants

Jnc: bad board

2020-05-02T18:23:57Z

bad board

@@ Line 22: / Line 22: @@
 Also, a card tagged "M8044-EH" has been seen; this is probably the result of a production error. An "M8044-EH" implies it is an MSV11-DE - which does not exist. An "M8044-EB" has also been reported.
-==Further reading==
+<!-- ==Further reading== -->
 ==External links==
 * [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/EK-MSV1D-OP-001%20MSV11-D,-E%20User's%20Manual.pdf MSV11-D,-E user's manual] (EK-MSV1D-OP-001)
 * [http://www.bitsavers.org/pdf/dec/qbus/MP00566_MSV11-D_Feb78.pdf MSV11-D Field Maintenance Print Set] (MP00566)

@@ Line 14: / Line 14: @@
 Note that, in common with many [[DEC]] boards, the ''model'' variant is '''not''' the same as the board variant; there is a 'shift' operation when going from one to the other. All MSV11-D cards are 'M8044-xy', where 'x' is not (necessarily) 'D'; all MSV11-E cards are 'M8045-xy', where 'x' is not (necessarily) 'E'. So the MSV11-'''D'''C is tagged 'M8044-'''C'''x' (where 'x' varies, depending on the source of the DRAM chips used).
-All are [[QBUS#Variable address size|Q18]] (hence, could not be used in Q22 systems, such as [[PDP-11/23]]'s with more than 256KB of memory). They had internal [[refresh]].
+All are [[QBUS#Variable address size|Q18]] (hence, could not be used in Q22 systems, such as [[PDP-11/23]]'s with more than 256KB of memory). They had internal [[memory refresh]].
 ==Errors==
-Note that "M8045" and "32K 18 BIT MOS MEM" is shown in the etch of the PCB used in both the M8044 and M8045; this occasionally leads to them being mis-identified. A quick glance at the board in question will show whether the middle column of DRAM chips (used for parity) is present (notice they missing, in the image above, of an M8044), and whether it is half- or fully populated.
+Note that "M8045" and "32K 18 BIT MOS MEM" is shown in the etch of the PCB used in both the M8044 and M8045; this occasionally leads to them being mis-identified. A quick glance at the board in question will show whether the middle column of DRAM chips (used for parity) is present (notice they are missing, in the image above, of an M8044), and whether it is half or fully populated.
 Also, a card tagged "M8044-EH" has been seen; this is probably the result of a production error. An "M8044-EH" implies it is an MSV11-DE - which does not exist. An "M8044-EB" has also been reported.

@@ Line 24: / Line 24: @@
 ==Further reading==
 * ''Microcomputer Products Handbook'', 1985 (pg. 12-1 to 12-8)
 [[Category: QBUS Memories]]

@@ Line 20: / Line 20: @@
 Note that "M8045" and "32K 18 BIT MOS MEM" is shown in the etch of the PCB used in both the M8044 and M8045; this occasionally leads to them being mis-identified. A quick glance at the board in question will show whether the middle column of DRAM chips (used for parity) is present (notice they missing, in the image above, of an M8044), and whether it is half- or fully populated.
-Also, a card tagged "M8044-EH" has been seen; this is probably the result of a production error. An "M8044-EH" implies it is an MSV11-DE - which does not exist.
+Also, a card tagged "M8044-EH" has been seen; this is probably the result of a production error. An "M8044-EH" implies it is an MSV11-DE - which does not exist. An "M8044-EB" has also been reported.
 [[Category: QBUS Memories]]

@@ Line 11: / Line 11: @@
 * MSV11-DC, -EC - 32KB (16K DRAMs)
 * MSV11-DD, -ED - 64KB (16K DRAMs)
 All are [[QBUS#Variable address size|Q18]] (hence, could not be used in Q22 systems, such as [[PDP-11/23]]'s with more than 256KB of memory). They had internal [[refresh]].
@@ Line 18: / Line 20: @@
 Note that "M8045" and "32K 18 BIT MOS MEM" is shown in the etch of the PCB used in both the M8044 and M8045; this occasionally leads to them being mis-identified. A quick glance at the board in question will show whether the middle column of DRAM chips (used for parity) is present (notice they missing, in the image above, of an M8044), and whether it is half- or fully populated.
-A card tagged "M8044-EH" has been seen; this is probably the result of a production error. The MSV11-DC is tagged 'M8044-Cx' (where 'x' varies, depending on the source of the DRAM chips used), and the MSV11-DD is tagged 'M8044-Dx' (likewise). An "M8044-EH" thus implies it is an MSV11-DE - which does not exist.
+Also, a card tagged "M8044-EH" has been seen; this is probably the result of a production error. An "M8044-EH" implies it is an MSV11-DE - which does not exist.
 [[Category: QBUS Memories]]

← Older revision	Revision as of 03:25, 8 February 2021
(No difference)

@@ Line 3: / Line 3: @@
 The '''MSV11-D''' (M8044) was a [[DEC card form factor|dual]]-height [[QBUS]] [[Dynamic RAM|DRAM]]  [[main memory]] card; the '''MSV11-E''' (M8045) is identical (apparently even using the same [[etch]] [[printed circuit board|PCB]]), but adds byte [[parity]]. They were used in the [[LSI-11]] [[PDP-11]].
-They held 64KB when fully populated with 16Kx1 DRAM [[integrated circuit|chips]]. Initially they used 4Kx1 DRAMs, giving 16KB when fully populated; later/larger ones used 16Kx1 DRAMs. The memory is arranged as 2 banks, each 16 data bits (one [[PDP-11]] [[word]]) wide, optionally with 2 additional bits for [[parity]] (1 per [[byte]]) in the MSV11-E. Half-populating them (i.e. 1 bank only) produced 8KB and 322KB sized versions (depending on DRAM type).
+They held 64KB when fully populated with 16Kx1 DRAM [[integrated circuit|chips]]. Initially they used 4Kx1 DRAMs, giving 16KB when fully populated; later/larger ones used 16Kx1 DRAMs. The memory is arranged as 2 banks, each 16 data bits (one [[PDP-11]] [[word]]) wide, optionally with 2 additional bits for [[parity]] (1 per [[byte]]) in the MSV11-E. Half-populating them (i.e. 1 bank only) produced 8KB and 32KB sized versions (depending on DRAM type).
 Four versions of the parity/non-parity types exist:

← Older revision		Revision as of 18:23, 2 May 2020
Line 15:		Line 15:

	They had internal [[refresh]].		They had internal [[refresh]].
		+
		+	A card tagged "M8044-EH" has been seen; this is probably the result of a production error. The MSV11-DC is tagged 'M8044-Cx' (where 'x' varies, depending on the source of the DRAM chips used), and the MSV11-DC is tagged 'M8044-Dx' (likewise). An "M8044-EH" thus implies it is an MSV11-DE - which does not exist.

	[[Category: QBUS Memories]]		[[Category: QBUS Memories]]